DS26504LNB2 Maxim Integrated Products, DS26504LNB2 Datasheet - Page 38
DS26504LNB2
Manufacturer Part Number
DS26504LNB2
Description
Network Controller & Processor ICs T1-E1-J1-64kHz Compo 4kHz Composite Clock
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26504L.pdf
(129 pages)
Specifications of DS26504LNB2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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DS26504 T1/E1/J1/64KCC BITS Element
individually poll certain bits without disturbing the other bits in the register. This operation is key in
controlling the DS26504 with higher-order languages.
Status register bits are divided into two groups: condition bits and event bits. Condition bits are typically
network conditions such as loss of frame or all-ones detect. Event bits are typically markers such as the
one-second timer. Each status register bit is labeled as a condition or event bit. Some of the status
registers have bits for both the detection of a condition and the clearance of the condition. For example,
SR2 has a bit that is set when the device goes into a loss-of-frame state (SR2.0, a condition bit) and a bit
that is set (SR2.4, an event bit) when the loss-of-frame condition clears (goes in sync). Some of the status
register bits (condition bits) do not have a separate bit for the “condition clear” event but rather the status
bit can produce interrupts on both edges, setting, and clearing. These bits are marked as “double interrupt
bits.” An interrupt is produced when the condition occurs and when it clears.
7.6 Information Registers
Information registers operate the same as status registers except they cannot cause interrupts. INFO3
register is a read-only register and it reports the status of the E1 synchronizer in real time. INFO3
information bits are not latched, and it is not necessary to precede a read of these bits with a write.
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